Staying in reality, I recall reading on Cryptome a long time back, a series of local Military Intelligence emails from local agents and police looking to not only purchase copies of DIRT (a basic arb trojan) for use on locals PC's - but also their emails mentioning the hunting of cool little electronic guns, to disrupt PC networks (presumably ahead of a raid, to stop the deletion of materials on multiple computers)
Your Faraday cage is meaningless - as anyone can intercept the electromagnetic radiation being picked up via the nearby telephone and its cord, coming out of the cage, (or the electrical wiring in the walls nearby).
(Unless you have some great way of accessing the internet from within a sealed Faraday cage, with no cords of any kind, and no electromagnetic communications possible either, to connect you to the internet

)
If you have some amazing non connection 'connection' technique to the Net, that involves NO radio waves, and no cords - then wooo good on you
But again, to the 99.8% of users, who just want to hide data from mom/dad/lovers/boss - that's easily done - it all depends what level you're operating at.
The serious classified arena has different rules, tools and behaviour to the standard materials and routine behaviours of the average civilian (including the civilian civil criminal) who thinks they and their arbitrary 'secrets' are somehow important - or that their civilian-available tools are somehow of value.
(To get a glimpse of some of the non-military low end gear used by Intelligence and law enforcement, have a look at
http://www.spyzone.com/ ( I got this url from the aforementioned local Military Intelligence emails)
Bear in mind these are 'low end' gear - non classified apps. The real stuff in use will only filter down from 'black ops' current usage, in about a decade or two. Military and classified gear is roughly 20 - 30 years ahead of standard 'public' available law enforcement materials..
--------------------------EXCERPT FROM EMAIL
"HOUSE OF SECURITY
First Draft
I expect the following :
* A. Required Demonstrations.
Tempest system monitoring.
Hope software.
GSM 2060 system if 900 MHz range9 (CCS International -
<http://www.spyzone.com>) Any other computer crime related
software tools that may be available. Any other products that CCS may sell that
could be of use to my org.
B. Gather as much information and catalogues as possible on items related to
our activities.Re
1. Technical support on DIRT. Implement the Email support that was started
before Eric Schneider left. Designated support person that will get to know our
situation and problems etc.
..
(If anyones interested, I can cut n paste the entire series of emails in the off-topic thread - as I see its disappeared from Cryptome itself, luckily I saved a copy

Its always interesting to read first person emails and communications by real intelligence operatives and Intel-gathering organisations themselves, in order to get a sense of their mindset and what they consider to be 'common knowledge' 'reality' and 'behaviour' - which shows a totally different, and usually far more complex reality than that as experienced by 'civilians' (even the tech-savvy civilians.)